Cobalt-nitrogen co-doped carbon nanotube catalyst, preparing method and application

Abstract

The invention discloses a cobalt-nitrogen co-doped carbon nanotube catalyst, a preparing method and application. Dopamine on carbon nanotubes are automatically polymerized and forms coordination bonds with cobalt ions, and the product is decomposed at high temperature to obtain the cobalt-nitrogen co-doped carbon nanotube catalyst with the carbon nanotubes as a core and an amorphous carbon layer as a shell structure. The amorphous carbon shell formed by polydopamine derivatization has rich structure defects, which is beneficial for forming cobalt-nitrogen / carbon active sites; as the carbon nanotubes are used as the core, the catalyst is excellent in conductivity and corrosion resistance. The two parts are used for achieving different functions, and efficient electrocatalytic activity is provided for the catalyst. In 1M potassium hydroxide solution, the half-wave potential of the catalyst is about 0.91 V, the content of hydrogen peroxide is smaller than 7%, and the stability is excellent. When the cobalt-nitrogen co-doped carbon nanotube catalyst is applied to a primary zinc-air battery, discharging voltage and currents and power density are remarkably improved, and the stability is good.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a cobalt and nitrogen co-doped carbon nanotube catalyst, a preparation method and an application. Background technique [0002] Metal-air batteries have a relatively high theoretical energy density, which is 2 to 10 times that of lithium-ion batteries, due to the use of inexhaustible oxygen from the outside world as the positive electrode reactant. Metal lithium, zinc, aluminum, magnesium, potassium, etc. can be used as the negative electrode of metal-air batteries, but lithium is extremely unstable in air and aqueous solution, and the self-discharge phenomenon of magnesium and aluminum is serious, which restricts the use of these metal materials as battery negative electrodes. Practical development and application. However, zinc and iron are relatively stable in aqueous solution and can be charged and discharged effectively. Compared with iron, zinc has a ...

AI Technical Summary

Problems solved by technology

So far, platinum-based catalysts are the best oxygen reduction catalysts, but platinum reserves are scarce and expensive, which is not conducive to large-scale application

Images